UWB Waveform Sequences With Aperiodic Zero-Correlation Zones
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Solution Overview
Problem
The existing ultra-wideband (UWB) sensing technologies face increased time requirements for sensing measurements due to the long length of transmitted waveform sequences, which can cause interference and reduce sensing performance.
Innovation Solution
A transmitted waveform sequence set is constructed without using cyclic prefix or suffix, utilizing aperiodic zero correlation zones and Hadamard matrices to ensure sensing performance while reducing air interface time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cyclic prefix and cyclic suffix are added to the transmitted waveform sequence to achieve periodic correlation characteristic, then the periodic autocorrelation characteristic is improved, but the actual length of the transmitted waveform sequence increases, increasing time required for sensing measurement
Solution Approach 1:
The patent extracts and removes the cyclic prefix and cyclic suffix from the transmitted waveform sequence. By using an aperiodic waveform sequence without these additional components, the patent achieves the same correlation characteristics without the time overhead, directly resolving the contradiction between correlation performance and measurement time.
Solution Approach 2:
The patent changes the parameter of waveform sequence from periodic (with cyclic prefix/suffix) to aperiodic. This parameter change allows the system to maintain adequate correlation characteristics while eliminating the time consumption associated with the cyclic components, thereby resolving the technical contradiction.
2Measurement precision
If the transmitted waveform sequence length is increased to improve sensing performance, then the sensing accuracy is improved, but the air interface time increases, causing interference to other devices
Solution Approach 1:
The patent segments the waveform sequence into N pulses distributed across Q pulse bursts. This segmentation allows the system to achieve sufficient correlation characteristics for accurate sensing without requiring a single long continuous sequence, thereby reducing the total air interface time while maintaining sensing accuracy.
Solution Approach 2:
The patent employs periodic transmission of Q pulse bursts with periodic zero correlation zones. This periodic structure enables the system to achieve accurate sensing measurements while controlling the total time occupation, preventing interference to other devices through structured time utilization.
Data Source
AI summary
A transmitting end determines a transmitted waveform sequence set, where the transmitted waveform sequence set includes N sequences, the transmitted waveform sequence set includes a sequence having an aperiodic ZCZ, and a sequence length of the sequence is Q. The transmitting end sends Q pulse bursts to a receiving end based on the N sequences, where each pulse burst includes N pulses, a jth pulse in an ith pulse burst in the Q pulse bursts corresponds to an ith element in a jth sequence in the N sequences, 1≤i≤Q, and 1≤j≤N.